DO700-en-GB_v2.3 3/15
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Conductivity Measurement Mode
Preparation for Measurement
1. Unscrew the protective cap on the probe jack located on the bottom of the meter (store the
protective cap in the carrying case for later use).
2. Carefully connect the electrode to the meter’s input jack. The electrode can only be inserted in
one orientation. Once it is firmly connected, screw the electrode collar onto the meter to secure
it.
3. Turn the meter on using the power key
.
4. Press and hold the ENTER key to select the desired mode: Conductivity, TDS (Total Dissolved
Solids), Salinity, or Resistivity.
Calibration
1. Press the CAL key and ‘CAL’ will appear flashing on the LCD.
2. Clean and dry the conductivity electrode (use distilled water to clean).
3. Immerse the electrode in the 1413
µ
S/cm calibration solution.
4. Stir the solution with the electrode and allow it to rest in the solution until the stabilize icon (
)
appears.
5. Press CAL again and the display will flash ‘1413
µ
S/cm’; After several seconds the ‘END’ icon
will appear and the meter will return to the measuring mode.
6. The LCD will display the icon ‘M’, indicating that the calibration is complete.
7. If the measurement value is unstable, repeat the calibration until the measurement is stable.
Replace the electrode if necessary.
Notes: The meter is calibrated before leaving the factory and can generally be used right out of
the box. The meter can only be calibrated in the Conductivity mode and not from the TDS,
Salinity, or Resistivity modes.
Measuring the Conductivity of a Sample
1. Clean and dry the conductivity electrode and immerse in the sample solution.
2. Stir the solution and allow the electrode to rest in the solution until the reading stabilizes (smile
face icon appears).
3. Read the conductivity measurement on the meter’s display.
5. Press and hold the ENTER key to select TDS (Total Dissolved Solids), Salinity, Resistivity, or
Conductivity measurement modes.
Calibration Considerations
This meter offers two calibration solution series (configurued in Parameter P1).
(a) (Europe & U.S.A. series) — 84
µ
S/cm, 1413
µ
S/cm, 12.88 mS/cm and 111.9 mS/cm
(b) (China series) — 146.6
µ
S/cm, 1408
µ
S/cm, 12.85mS/cm and 111.3 mS/cm
The DO700 offers a unique one-point calibration feature. The user can select the calibration solution
closest to the expected measuremnt value. In general the most common calibration solution is 1413
µ
S/cm. Use the supplied conductivity electrode (K = 1 cm-1), and perform the calibration using the
supplied 1413
µ
S/cm calibration solution. The meter can then be used for measurements below 100
mS/cm. Please refer to the chart below.
